AI 中文总结
研究利用JWST的NIRCam及HST存档图像，对与椭圆星系VV191a相关的球状星团候选体进行研究。通过形态学滤波等方法得到61个可能的球状星团样本，分析其年龄、金属丰度等特征，揭示了该星系中球状星团群体情况及相关研究局限性。
AI 中文摘要
我们利用詹姆斯·韦布空间望远镜（JWST）的近红外相机（NIRCam）和哈勃空间望远镜（HST）存档图像，研究与椭圆星系VV191a相关的球状星团（GC）候选体。从500多个候选源的初始目录开始，我们应用形态学滤波、光度红移选择和使用BAGPIPES进行光谱能量分布（SED）拟合，以分离出61个可能的球状星团的精炼样本，包括20个高置信度的子集。得出的年龄分布集中在约6 - 10吉年之间，峰值在约8吉年附近，而金属丰度主要接近和高于太阳。与椭圆星系中的许多球状星团系统不同，VV191a样本没有显示出明显的双峰金属丰度分布。推导的恒星质量范围很广，表明与来自重叠螺旋星系VV191b的尘埃消光和前景污染存在显著简并。这些结果支持了VV191a中存在演化的球状星团群体，同时突出了宽带SED拟合和前景污染带来的局限性。
英文摘要
We investigate globular cluster (GC) candidates associated with the elliptical galaxy VV191a using JWST NIRCam and archival HST imaging. Beginning with an initial catalog of over 500 candidate sources, we apply morphological filtering, photometric redshift selection, and spectral energy distribution (SED) fitting using BAGPIPES to isolate a refined sample of 61 probable GCs, including a high-confidence subset of 20 objects. The derived age distribution is concentrated between ~ 6-10 Gyr, with a peak near ~ 8 Gyr, while metallicities are predominantly near and super-solar. Unlike many GC systems in elliptical galaxies, the VV191a sample does not exhibit a clear bimodal metallicity distribution. Derived stellar masses span a broad range and suggest significant degeneracies related to dust attenuation and foreground contamination from the overlapping spiral galaxy VV191b. These results support the presence of an evolved GC population in VV191a while highlighting limitations imposed by broadband SED fitting and foreground contamination
